Answer:
It worth to use Oil A because you save more than $10 coupon
Step-by-step explanation:
To know which option is best, we have to calculate how much will we save by using Oil A.
600 miles long
Saving= 60 cents in gas for every 20 miles
Saving with Oil A will be= 0,60/20 * 600= $18
It worth to use Oil A because you save more than $10 coupon